Niall Glundub

Niall Glundub (869-14 September 919) was King of Ailech from 911 to 919 (succeeding Domnall mac Aeda and preceding Fergal mac Domnaill) and High King of Ireland from 916 to 919 (succeeding Flann Sinna and preceding Donnchad Donn).

Biography
Niall Glundub was born in 869, the son of Aed Findliath. He succeeded his brother Domnall mac Aeda as King of Ailech in 911, and he extended his control to neighboring kingdoms after defeating the army of Ulaid at Glarryford; in 916, he became the new High King of Ireland after Flann Sinna's death. In 917, when Sihtric Caech arrived in Ireland with a new Viking army, Niall led an army to face them, only to be heavily defeated and lose Dublin to the Norse. In 919, he was slain in battle with the Norse at the Battle of Islandbridge.